I had a pair of 50x and loved them, awesome music cans.
However if you have big eara then a good pair of soft ear replacements are worth the money. The leather gets uncomfortable quick.
I use the same sound card, do you use the third party UNi Drivers?

Lasted a good 2.5 years at constant use.
Just wasn't expecting, nor ready for them to die yet.
In regards to your monitor,
https://www.pccasegear.com/products/37084/asus-pg248q-rog-swift-24in-esports-g-sync-180hz-gaming-monitor
G-Sync is the tits.